Adsorption Equilibria of Methane, Ethane, Ethylene, Nitrogen, and Hydrogen onto Activated Carbon

Abstract

Adsorption equilibria of single components for pure methane, ethane, ethylene, hydrogen, and nitrogen onto activated carbon adsorbent (Calgon Co.) were measured. The results were obtained with a static volumetric method at 293.15 K, 303.15 K, and 313.15 K and at pressures up to 2 MPa. Experimental data were correlated by the Langmuir−Freundlich equation. Isosteric enthalpies of adsorption were calculated and shown according to surface loading.

Behavior of ethylene and ethane within single-walled carbon nanotubes. 1-Adsorption and equilibrium properties

“…At high pressures the dominant aspect ruling over adsorption is apparently an entropic factor, related to the packing efficiency of molecules; it is reasonable to assume that a smaller molecule (ethylene) is able to better accommodate inside the nanotube than a larger one (ethane). This general occupancy tendency and the cross-over just mentioned have also been observed in experimental data for ethylene and ethane adsorption onto activated carbons (Choi et al 2003) and in GCMC simulations of the same fluids in carbon slit-pores (Curbelo and Müller 2005).…”

Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores

“…Some well-known examples of these developments include the Tόth 11 equation (Toth 1962) and the Freundlich equation (Freundlich 1926) both of 12 which have been used for hydrogen adsorption analysis by Gil et al (2009), the 13 Sips equation (Sips 1948) which has been used for analysis by Johansson et al 14 (2002), the modified Dubinin-Astakhov equation (Richard et al 2009) which has 15 been used for analysis by Poirier et al (2006), and the Langmuir-Freundlich 16 equation which has been used for analysis by Choi et al (2003). 17 18 In order to explore the application and credibility of these and other adsorption 19 models for extraction of a variety of parameters including the total hydrogen 20 uptake, selected isotherm equations were applied to hydrogen uptake data for six 21 different nanoporous materials as detailed in the following sections.…”

Fabrication of a room temperature hydrogen sensor based on thin film of single-walled carbon nanotubes doped with palladium nanoparticles

“…The selectivity of the hydrogen sensor was also evaluated via following the interfering effects of some gaseous species. The interfering effects of gaseous species usually take place by numerous processes; often via adsorption [37,38]. In this study, the interference effects of at least 200-fold excess (mass/mass) of some foreign gaseous species including humidity, hydrogen sulphide, methane, carbon dioxide and carbon monoxide in nitrogen were considered.…”